Dry-ore-concentrating table.



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APPLIUATION FILED DBO. 13, 1904.

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DRY ORE GONGENTRATING TABLE.

APPLICATION FILED DBG. 13, 1904.

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wihwomzs PATENTED SEPT. 5, 1905.

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o o/o A. TETRAULT & E. G. POI-ILE.

DRY ORE CONCBNTRATING TABLE.

APPLICATION FILED 1320.13, 1904.

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UNITED sTETEsYY vrEATENT oEEIcE.

DRY-ORE-CONCENTRATING TABLE.

Specification of Letters Patent.

Patented Sept. 5, 1905.

Application tiled December 13, 1904. Serial No. 236,717.

Be it known that we, ALExIsIETnaUI and EDWIN C. PoHL,citiZens of the United States, residing at Boulder', in the county of Boulder and State of Colorado, have invented certain new and useful Improvements in Dry-Ore-(oncentrating Tables; and we do hereby declare the following to be a full, clear` and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention is directed to the production of an improved table separator and concentrator for ores in the condition of dry powder while being subjected to a reciprocating knocking movement within a chamber of the table under the suction and exhausting' force of air therein.

'lhe following description, read in connection with the accompanving drawings, will enable any person skilled in the art to which our invention relates to understand its nature and to practice it in the form in which we prefer to employ it; but it will be understood that our invention is not limited to the precise form and construction herein illustrated and described, as various modilications and changes may be made without exceeding the scope of the claims or theinvention therein set out.

Referring to the drawings, Figure l represents in top view an ore-separating table having a chambered top surface upon and within which the separation of the heavier from the lighter or waste particles are effected by the combined reciprocating bumping movements of the table and the force of air-currents drawn by suction over the inclosed surface of the table. Fig. 2 is a vertical longitudinal section showing the table-chamber and its airsuction connections, taken on the line l 1 of Fig. l, showing the suction device in elevation. Fig. 3 is a vertical transverse section taken through the chambered table on the line .2 2 of Fig. l. Fig. et is a vertical transverse section taken through the chambered table on the line 3 3 of Fig. l, showing the openings through which the lighter particles are carried from said chamber into the exhaust. Fig'. 5 shows the openings at the end of the table through which air is drawn into its chamber. Fig. 6 is a detail in section of Fig. T is a transverse section through the suction-pipeand its regulatii1g-val\'e.

".Ihe table l, preferablyr of oblong rectangular form, is constructed with a smooth surface and a closed cover Q, forming a chamber 3, the area of the table within which the separation and concentration of the ore is effected in a manner and b v means which constitute my invention. Upon a suitable foundation-frame are pivotally mounted in bearings I rocker-supports 5, arranged, preferably, to support the four corners of the table, while the latter has bearings G to receive the supports and accommodate the reciprocating movements of the table. Air is preferably drawn into the table-chamber at one end through openings, (seen in Fig. 5,) and from this end the table inclines downward to its other end, as seen in Fig. 2, its pair ot' supports for this purpose at its highest end being longer than the pair of supports at its lowest end. rIhe tal )le-mountings are preferably arranged to allow the table to be reciprocated in a direction at right angles to the direction of the air-currents within and through the table-chamber, and for this purpose the delivery of the values or heavier particles of ore is effected at one side 'of the table and the means for effecting' its movements are arranged at its opposite side. These means may consist of a power-driven shaft 8, having an eccentric t), a connecting-rod 10, from which, by suitable means, is connected to the table, so that the rotation of the eccentric gives reciprocating movements to the table. lhe eccentric-rod connections may be by bow-spring 11, links I2, and screw-rod13 engaging' a. bracket l-t on the table, such engagement being made adjustable by nuts 15. An abutment le, depending from the table, is adapted to engage an abutment I7, risingfrom the foumation-frame, to give a bumping action to the table movement.

IVe prefer to mount tle feed-hopper 18 at that side of the table to which the reciprocating power is applied and at the corner of the end at which the air is drawn into the chamber, so that the ore will pass from the hopper upon the table at right angles to the direction of the air-currents which are created Vfrom the opposite end of the table, as we will now state. At and upon this end of the table an exhaust-chamber I9 is transversely arranged, so that its inner wall has communication with the table-chamber by openings seen in Fig. 4. This chamber is formed by a narrow box on IOO IIO

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a level with the table which forms its bottom, and the suction device drawing the airfrom it produces therein a partial vacuum, the effect of which is to cause the currentsto be spread and be diffused within the table-chamber to pick up the lighter particlesfrom the powder and carry them out.

An air-suction device 20 is connected by a pipe 21 to that end of the vacuum or exhaustchamber at the side of the table at which the power is applied, and this pipe is connected to said chamber by a suitable flexible connection 22 to accommodate the movements of the table and maintain the suction connection. The suction device may be of any suitable construction adapted to be driven b'y power, and to regulate the force and volume of the air-currents drawn through the table-chamber we provide the pipe which connects the suction device with the table exhaust-chamber with an air-inlet 23, controlled by a valve 24, which may be a cap carried by a screwstem 25, by which the cap may be adjusted to increase or to diminish the area of said airinlet to increase or diminish the force of `the air-suction in the exhaust-chamber and correspondingly increase or diminish the volume and force of the air-currents drawn into and through the table-chamber to suit the character of the ore to be separated, as no two ores are of the same specific gravity. By raising the valve the force of the volume of the aircurrents drawn into the chamber over the table is weakened and lessened, and by closing the valve a greater and stronger volu'me of air is drawn in the table-chamber through and over the powder.

As seen in Fig. 3, the table-chamber has a greater depth at its side where the ore is received from the hopper than at the delivery side, and the purpose of this is to facilitate the separation of the finer substances and cause them to be carried by the stronger aircurrents toward the exhaust-chamber, while the heavier substances by reason of the bumping action of the table gradually move across its surface to its delivery side under the separating action of air-currents of less force. As the pulp spreads on the table it takes less room and the air-currents have better eect in taking up and carrying off the dust and lighter particles which come with the values from'the Crusher or pulverizer. 'This separating action is aided by the inclination of the table, which by gravity under the bumping movement of the table causes the lighter substance to be thrown to the surface and kept in motion to receive the full effector' the air-currents carrying it into the exhaust-chamber, the heavier substance moving unaffected by the air-currents across the table to the delivery-opening, the suction force from the exhaust-chamber picking up the silica and lighter material and collecting it in said exhaust-chamber, from suction device. For this purpose We provide openings, seen in Fig. 4, and which we prefer to make in the form of a slot or slots 26, opposite the pipe of the suction device, to cause a greater volume of air to be drawn through the table-chamber along its feedhopper side, where the ore is thickest on the table, while other smaller openings 28, eX- tending to the delivery side of the table, cause a less volume of air-currents to be drawn through the table-chamber over the thinner spread of the ore. Cooperating with these air-exits from the table-chamber into the eX- haust-chamber, we provide air-inlet openings at the other or highest end of the table-chamber in the form of slots and perforations 29, the perforations being preferably next to the hopper side of the table and the slots 30 eX- tending toward the delivery side of the table, whereby the light substances are caused to travel in a diagonal course in the chamber to the suction corner thereof and allowing the concentrates to spread on the table,'as indicated by the dotted arrows in Fig. 1.

We prefer to make that section of the tablechamber cover neXt the delivery side of the table of glass 31 to allow inspection by the i operator of the air-separating force within the chamber, so that he may regulate the force .of the air-currents by the valve to remove only the lighter substances from the pulp.

From the foregoing description it will be seen that in the employment of the concentrating' chambered table the separation is effected by the reciprocating bumping' action of the table, by air-currents produced by suction through the table-chamber, by the action of an exhaust-ch amber having communication with a suction device and with the tablechamber, and by the downward inclination of the table-chamber from its air-inlet end to the suction device; but while these several agencies are conjointly effective the two primary agencies in the operation are the reciprocating bumping' movements of a chambered table and the production of air-currents within and through the table-chamber` whereby `to carry olf from said table and out of its chamber the waste or lighter substance of the pulp, leaving the concentrates 0r values to be delivered from the table by its movements at right angles to the direction of the air-currents, which are admitted at one end of the tabla-crossing the travel of thel pulp on the which it is drawn into and forced from the this exhaust-chamber adds to the efficiency of IOO the air separation, obviously the chambered table and the suction device, under the reciprocating' bumping of the table, will cause the separation of the lighter stuff from the values and the delivery of each in different directions from the table.

lt is important to note that the location of the valve in the pipe of the suction device causes the latter to draw air with more or less volume from said pipe-opening' directly into the suction device, and thereby causes greater or less suction force in the exhaustchamber, creating therein a partial vacuum, according to the force of the suction, and it is this exhausting' of the air from said chamber that causes the air-currents drawn therein from the separating-chamber to be spread over the table-surface and to be drawn through said chamber with more or less force controlled by said valve.

While the table is described as having a bumpingmovement, and which is preferred, obviously a quick reciprocating' movement would be effective for shaking' up the lighter particles and dust to be carried olf by the suction device.

ie claim- 1. In a dry concentrator, a quadrilateral smooth-surfaced table, a cover therefor supported at a distance therefrom to form a chamber leaving opening's across three edges of the table the openings at two of said edges being Vfor the inlet and for the outlet of aircurrents, the other for the discharge of the concentra tes, a closure for the fourth edge of said table-chamber, a feed-hopper opening into the table-chamber on its closed side, means to draw air into, through and from said chamber between the feed-hopper and the delivery-opening and means for imparting' reciprocating bumping movements to said table.

Q. The combination of a quadrilateral smooth-surfaced table, a cover therefor supported ata distance therefrom to form a chamber leaving' openings across three edges of the table, a closure `for the fourth edge thereof, a casing fo rming' an exhaust-chamber extending across the openings at one end of the tablecham ber, means to draw air therefrom, a feedhopper opening into the table-chamber on its closed edge, and means for causing reciprocating' bumping' movements to said table.

3. The combination of a quadrilateral smooth-surfaced table, a cover therefor supported at a distance therefrom to form a chamber leaving openings entirely across three edges of the table, a closure for the fourth edge thereof, a casing forming an exhaustchamber extending entirely across the openings at one end of the table, means connected to that end of said exhaust-chamber next to the closed edge of said table-chamber to draw air into, through and from the table-chamber, a feed-hopper opening into the table-chamber on its closed edge, and means for imparting reciprocating knocking movements to said table-chamber.

4. 1n a dry concentrator, a smooth-surfaced table, a cover therefor forming a top chamber, leaving openings across three edges of the table, a closure for the fourth edge thereof, a casing forming an exhaust-chamber extending' across the openings at one end ofthe table, a pipe connected to one end of the exhaust-chamber, means to draw air therefrom connected to said pipe.` an open-ended pipe rising from the latter` a valve controlling said open-ended pipe for regulating the volume and force of theair-currents. a feed-hopper opening' into the table-chamber at its closed edge, and means for causing reciprocating bumping' movements to said table.

5. ln a dry concentrator, the combination of a table, a cover therefor forming a top chamber, a casing forming an exhaust-chamber across the end of said table having openings communicating with the table-chamber, a suction device, a flexible pipe-section connecting the suction device and the said transverse end chamber, the cover of said table leaving air-inlet openings for the table-chamber` means for imparting' to said chambered table reciprocating' bumping movements at right angles to the course of the air-currents entering the tablcchamber, and means Vfor feeding powdered ore into the table-chamber.

6. An ore-concentrating table having a smooth surface, a cover therefor forming a top chamber leaving air-inlets at one end, and air-outlets at its opposite end, the third edge of said chamber being closed, and its opposite fourth edge delivering the concentrates, a feed-hopper opening' into said chamber at its closed edge, means to draw air into, through and from said chamber, and means for causing said table to have reciprocating bumping movements.

7. In a dry concentrator, the combination of a smooth-surfaced table, a cover therefor forming atop chamber leaving openings along 'three edges of said table, the openings along one edge forming air-inlets, the openings along the opposite edge forming air-outlets, the openings along the third edge for the delivery of the concentrates, a closure for the fourth edge of said table-chamber, a casing forming an exhaust-chamber carried by said table into which said air-outlets open, a Vfeedhopper opening' into the table at its closed edge, a suction device connecting' said exhaust-chamber, and means for causing' said chambered table to have reciprocating bumping' movements.

8. A dry-ore-coneentrating table having' a smooth surface, a cover therefor forming a top chamber one edge of which is closed, its three other edges being' open, a feed-hopper comm unicating with said chamber at its closed edge, its opposite open edge delivering the IOO IIO

concentrates, means having connection with the end of the table at its'closed edge for drawing air into and through said chamber from one open edge of the table through its opposite open edge across the path of the moving powder.

9. A dry-ore-concentrating table having a smooth surface, a cover therefor forming a top chamber, a feed-hopper opening into said chamber at its closed edge, a pair of rockersupports for each end of the table, one pair having a greater length than the other pair, means having connection with the lowest end of the table-chamber for drawing ai r-currents into and through -it from its highest open edge across the path of the moving powder, and means for causing said chambered table to have sidewise bumping' movements.

lO. The combination of a smooth-surfaced table, a cover therefor forming a top 'chamber, a pair of rocker-supports for each end of the table, one pair having a greater length than the other pair, a feed-hopper at one side in communication with said table-chamber, said table-cover having a delivery-opening at that side opposite the feed-hopper, means for causing said chambered table to have a sidewise bumping movement, and means having connection with the lowest end of the tablechamber for drawing air-currents into and through it from the highest end of said tablechamber across the path of the moving powder.

l1. The combination of a smooth-surfaced table, a cover therefor forming a top chamber, a feed-hopper.at one side in communication with said table-chamber, said cover having a delivery-opening at the opposite side of said chamber, a casing forming an exhaustchamber carried by saidY table and having communication with the tablechamber, a suction device for causing' air-currents to be drawn into and through said table and said exhaust-chamber, a pipe open at its upper end and connecting said exhaust-cham ber with the suction device, a valve controlling said open pipe, and means for causing said chambered table to have reciprocating' bumpingA movements. I

12. A concentrating smooth-surfaced table, a cover therefor forming a top chamber,

means forl causing said table to have bumpling movements, a suction device for causing air-currents to be drawn into and through the table-chamber, a casing forming an exhaustchamber carried by the table having corn-V gmunication with the suction device and with fthe table-chamber, a valve for controlling the force of the suction within the exhaust-chamber, a feed-hopper opening into one side of the table-chamber, said table vand its cover providing air inlet and outlet openings and an opening for the delivery of the concentrates. 13. Aconcentratingsmooth-surfaced table, ,a transparent cover therefor forming a top chamber, a feed -hopper opening into said chamber, a casing forming an exhaust-chamber across Yone end of said table-chamber and ,having communication therewith, a suction device connected with said exhaust-chamber for causing air-currents to be drawn into and through said table-chamber and into and fthrough said exhaust-chamber, and means for causing' reciprocating movements of said table. i4. A d ry-ore-concentrating table having a ismooth surface, a cover therefor forming a ,top chamber, a feed-hopper opening into said chamber atits closed edge, a casing forming an exhaust-chamber across one end of the tablechamber means for imparting to said chamber reciprocating bumping movements, the said table-chamber having a plurality of airi inlet slots and perforations along one edge, the vsaid casing having a slot and perfor-ations in communication with the tablechamber,the airinlet slots and the slot in the exhaust-chamber having diagonal relation relative to the tablelchamber, and a suction device arranged to communicate with that end of the exhaustchamber next the closed edge of the tablechamber, whereby air-currents are drawn into the table-chamber diagonally across the path of the moving' powder.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

ALEXIS TETRAULT. EDWIN C. POHLE.

Vitnesses:

HENRY O. ANDREW, CHAs. OCoNNon 

